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Printer interface to Samsung ARM-7

prasadAradhya prasadAradhya over 12 years ago

Note: This was originally posted on 25th June 2009 at http://forums.arm.com

Hi
I am interfacing the Dot matrix printer (EPSON 1000 series) to an Samsung processor which as ARM - 7 architecture, through Parallel port.
I wanted to print text and graphics. Now i am trying to send text to print and the same i am displaying on the display. On the display the data sent is displayed correctly,
but on the printer it is displaying 'PPPP' some junck even if i am not sending any data, If i press print button, then it self its printing junck characters.
I am not able to understand why its happening.
I am sending ASCII value of a character to printer.
I am writing program in Embedded C.
If any one know please help me.

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prasadAradhya prasadAradhya over 12 years ago

Note: This was originally posted on 26th June 2009 at http://forums.arm.com

Are you using a serial or parallel printer; if it's serial, are you using the correct baud rate, stop-bits etc.?

s.

I am using Parallel port. Samsung Processor works with 3.3V so 74HCT245 Ic is used to convert 3.3v to 5V for data pin D0 - D7, and for control pins i have used transistor to provide 5V
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prasadAradhya prasadAradhya over 12 years ago

Note: This was originally posted on 26th June 2009 at http://forums.arm.com

Are you using a serial or parallel printer; if it's serial, are you using the correct baud rate, stop-bits etc.?

s.

I am using Parallel port. Samsung Processor works with 3.3V so 74HCT245 Ic is used to convert 3.3v to 5V for data pin D0 - D7, and for control pins i have used transistor to provide 5V
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